2: Installation
APCD-WM001-1.0
14
2.3.2 Connecting to Vehicle Power System
The MMT9000 is designed to work directly from the v12VDC electrical system or from
a +12VDC power distribution panel.
Included in the MMT9000 kit is an 18-ft., 4-wire, 18-gauge cable with an 2-amp inline fuse kit
(see
). The connector to the modem is a twist-lock assembly. The following
table shows the wire color and its purpose:
The MMT9000 also has a ground lug on the connector endplate which should be connected to
the vehicle ground system.
The MMT9000 can be installed in other locations than just a vehicle, so long as the input
power is 13.8 VDC +/- 25% and there is a ground system.
2.3.3 Connecting the End-User’s PC
The Ethernet interface on the MMT9000 is a 10BaseT Ethernet RJ-45 receptacle. If
connecting directly to the end-user’s PC, a crossover cable is required. If connecting to an
Ethernet hub or switch, a straight-through Ethernet cable is used.
The Ethernet cable must be able to withstand the same environment as the MMT9000, so
cable rated as CAT5 outdoor or better is recommended
An Ethernet surge suppressor should be connected as close as possible to the MMT9000
Ethernet interface. This suppressor must be connected to the chassis ground.
As noted, there are many ways to connect the MMT9000 to the end-user’s PC, using Ethernet
switches, IP routers, etc. The discussion below is for the simplest, most direct method of
connection.
1. Connect the end-user’s PC by attaching a crossover Ethernet cable between the
Ethernet port on the end-user’s computer and the Ethernet port on the modem.
2. Apply power and wait 10 seconds for the MMT9000 to come up.
3. Check the Ethernet LEDs on the Ethernet interface of the modem and/or end-user’s
PC to ensure the Ethernet connection between the MMT9000 and the end-user’s PC
is active. Refer to
for an explanation of the Ethernet LEDs normally
provided on Ethernet interface cards.
Table 7 MMT9000 Wiring to Vehicle Power System
Wire Color
Description
Black
0 VDC (Battery Negative side)
Red
+12 VDC
White
Ignition Sense: +12VDC turns unit on. Tie to
Red if not using ignition sensing
Green
Chassis ground, same ground as antenna
base.